Abstract
Construction surplus soil is being inappropriately disposed and local governments have been establishing local ordinances to solve the problem. In order to analyze the problem and to propose effective countermeasures, this study identifies pattern of the inappropriate disposal, the environmental risks, economic incentives of the activities, and limit of the existing legislations. It applies Interpretive Structural Modeling to the cases, and demonstrates that the activities are conducted by incentives both of those discharging and of those accepting the surplus soil. It analyzes data on removed surplus soil in FY 2010 at Kanagawa Prefecture. Compare to the cases of private construction, the movement lengths of surplus soil are shorter, number of the destination sites from one construction is smaller, and official notices seem to be better observed at the cases of public construction. Municipal ordinances seem neither to restrict nor to attract immigration of the soil. It also analyzes prefecture ordinances and identifies necessity of a new legislation which materializes liability of discharger based on the Basic Act on Establishing a Sound Material-Cycle Society, and proposes concrete measures.
